Noise Reduction using Paired-microph Microphone Arran

A wide variety of microphone arrays have been developed, and the authors have also proposed a type of equally-spaced small-scale microphone array. In this approach, a paired-microphone is selected at each frequency to design a subtractive beamformer that can estimate a noise spectrum. This paper introduces a nonequally-spaced microphone arrangement, which might give more spatial information than equally-spaced microphones, with two criteria for selecting the most suitable paired-microphone. These criteria are based on noise reduction rate and spectral smoothness, assuming that objective signals are speech. The feasibility of both the non-equally-spaced array and the criterion on spectral smoothness are confirmed by computer simulation.